linux-kernel - Re: [PATCH] mtrr use type bool

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Date:	Wed, 31 Oct 2007 12:20:16 -0400
From:	lsorense@...lub.uwaterloo.ca (Lennart Sorensen)
To:	Richard Knutsson <ricknu-0@...dent.ltu.se>
Cc:	Paul Jimenez <pj@...ce.org>, rgooch@...f.csiro.au,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mtrr use type bool

On Wed, Oct 31, 2007 at 04:27:31PM +0100, Richard Knutsson wrote:
> Paul Jimenez wrote:
....
> >-			usage_table[i] = usage_table[replace] + !!increment;
> >+			usage_table[i] = usage_table[replace] + increment;
> >  
> This seems a bit strange, using a boolean as an integer (yes I know, it 
> works but semantically...). What about:
> 
> +			usage_table[i] = usage_table[replace];
> +			usage_table[i] += increment ? 1 : 0;

What is wrong with:
usage_table[i] = usage_table[replace];
if (increment)
	usage_table[i]++;

I hate code with the '?' operator in general.  It's a conditional either
way, and at least this way you wouldn't even have to do a store in one
of the two cases 9although if the compiler can't figure out that is the
case already, then it really sucks).

Pauls code at least didn't involve a conditional at all, but on the
other hand is less clear to read.

--
Len Sorensen
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